166564975 has 12 divisors (see below), whose sum is σ = 206706016. Its totient is φ = 133145280.

The previous prime is 166564961. The next prime is 166565017. The reversal of 166564975 is 579465661.

It is not a de Polignac number, because 166564975 - 2²³ = 158176367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48154 + ... + 51496.

Almost surely, 2^166564975 is an apocalyptic number.

166564975 is a deficient number, since it is larger than the sum of its proper divisors (40141041).

166564975 is a wasteful number, since it uses less digits than its factorization.

166564975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5346 (or 5341 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 49.

The square root of 166564975 is about 12906.0053850911. The cubic root of 166564975 is about 550.2092592158.

The spelling of 166564975 in words is "one hundred sixty-six million, five hundred sixty-four thousand, nine hundred seventy-five".